单项选择题

Smoking is a very bad habit, which many people find difficult to ______.

A．break
B．beat
C．breathe
D．cough
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单项选择题
The disease has completely ______ in this country.
A．died out
B．died down
C．died away
D．died off
单项选择题
The ______ estimate of gains in gross national product suggested a fast recovery from economic recession.
A．introductory
B．possible
C．primary
D．preliminary
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